3x+4x-15+x=90

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Solution for 3x+4x-15+x=90 equation:


Simplifying
3x + 4x + -15 + x = 90

Reorder the terms:
-15 + 3x + 4x + x = 90

Combine like terms: 3x + 4x = 7x
-15 + 7x + x = 90

Combine like terms: 7x + x = 8x
-15 + 8x = 90

Solving
-15 + 8x = 90

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '15' to each side of the equation.
-15 + 15 + 8x = 90 + 15

Combine like terms: -15 + 15 = 0
0 + 8x = 90 + 15
8x = 90 + 15

Combine like terms: 90 + 15 = 105
8x = 105

Divide each side by '8'.
x = 13.125

Simplifying
x = 13.125

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